LM5022: LM5022 about

Use an isolated flyback

thanks for the reply

I'll just ask one more question

The data sheet says that when the cs pin of the lm5022 becomes 0.5V, it does not work.


So I shorted it to allow overcurrent to flow.

However, the voltage on the cs pin does not rise to 0.5V and the operation does not stop.

Can you tell me why??

(The red part of the attached circuit diagram was short-circuited.)

input voltage : 14.1~32V output : 12V 1A

Hello Seung, 

Thanks for your reply. At page 21 of the datasheet, section 8.2.2.9 you can find a description of how to select the sense resistor. The converter enters current limit when the voltage drop on the sense resistor is 0.5V, therefore in you case you might need to change the value of the sense resistor so that the converter enters current limit when the peak current reaches the value you want. Let me know if I can help you furthermore. 

Kind regards, 

EM 

thanks for the reply

Since the input voltage is larger, it is calculated as a -value.

Is this calculation correct?